(Windows -> macOS) - Can't enter 'ÆØÅ' in macOS

[synergy-genericuser 0]

I've had Synergy for a long time but haven't gotten around to having a use for it until now.

I have a very infuriating problem, when trying to type the Danish letters 'ÆØÅ' and some other characters like ' ¨ ' on the sever (Windows) it won't type the letters on macOS (client). Both computers use the same keyboard language. It's not like another letter is written or something, nothing happens at all.

I can find absolutely nothing about this problem anywhere. Hope someone here can help as the program is otherwise unusable. Thanks for any help.